报告人：朱福荣 教授（香港浸会大学）
报告题目：Narrowband Near-Infrared Perovskite/Polymer Hybrid Photodetectors
报告时间：2025年10月26日上午10:00
报告地点：909-B厅
报告摘要：
Solution-processable halide perovskite semiconductors possess unique optoelectronic properties, making them promising candidates for applications in perovskite solar cells and photodetectors (PDs). Discrete perovskite PDs typically exhibit a broadband photoresponse, with high sensitivity across the visible wavelength range. In contrast, polymer-based PDs can achieve extended photoresponsivity, covering a broad spectrum from visible light into the near-infrared (NIR) region, often exceeding 1100 nm. Achieving narrowband NIR photodetection using these broadband PDs generally requires the integration of optical filters or specially engineered photonic structures to restrict the device response to a defined wavelength range. However, conventional filters are often rigid and challenging to miniaturize, complicating the assembly of compact optical units. The inclusion of bandpass filters can diminish the overall radiometric performance of the photodetectors, increasing both device complexity and cost during integration. Therefore, developing alternative strategies for wavelength-selective photodetection remains a critical challenge for advancing narrowband NIR PD technologies [1-5].
To achieve narrowband photodetection, approaches such as microcavity integration and the charge collection narrowing (CCN) effect have been explored. CCN-type photodetectors utilize thick photoactive layers to selectively suppress the collection of charge carriers generated by visible light near the surface, but this method poses notable challenges: (1) responsivity is limited due to significant attenuation of incident light, (2) increased thickness leads to slower response speeds and reduced cut-off frequency, and (3) the detectable spectrum is restricted by the absorption edge of the photoactive material, limiting device design flexibility. To address these issues, we present a novel hybrid PD architecture with dual heterojunctions, perovskite/polymer and polymer/polymer structures. This approach enhances hole transport efficiency using a thinner photoactive layer, enables narrowband NIR detection via space charge accumulation at the perovskite/polymer interface, and provides greater design flexibility through customizable layering of charge transport and NIR-absorbing polymers. The resulting hybrid PDs show markedly improved responsivity and response speed and achieve narrowband NIR photodetection with a -3 dB cut-off frequency of 300 kHz. These advances offer broad potential for bio-imaging, environmental sensing, and security monitoring applications.
References:
[1] Y. Tang, Z.M. Wang, M.S. Gao, J.Y. Han, L.M. Yuan, F.R. Zhu, Nat Commun., 2025, 16, 7144.
[2] Z.J. Lan, Y.L. Lei, W.K. Chan, S.M. Chen, D. Luo, F.R. Zhu, Sci. Adv. 2020, 6, eaaw8065.
[3] Z.J. Lan, Y.S. Lau, L.F. Cai, J.Y. Han, C.W. Suen, F.R. Zhu, Laser & Photonics Reviews, 2022, 16, 2100602.
[4] Z.M. Wang, Y. Tang, J.Y. Han, F.R. Zhu, Appl. Phys. Lett., 2024, 124, 021103.
[5] Z.J. Lan, L.F. Cai, D. Luo, F.R. Zhu, ACS Appl. Mater. Interfaces, 2021, 13, 981-988.
个人简介 ：
朱福荣教授现任香港浸会大学理学院物理系讲座教授，兼任理学院副院长（负责科研与研究生事务）。他分别于1983年和1987年在上海复旦大学获得物理学学士和硕士学位，并于1993年在澳大利亚查尔斯达尔文大学获得应用物理学博士学位。朱教授于1993至1995年在日本京都大学电气与电子工程系从事博士后研究，随后于1995至1997年在澳大利亚默多克大学担任研究员，主要研究等离子增强化学气相沉积法制备的硅薄膜及其器件应用。1997年，朱教授加入了新加坡材料研究与工程研究院（IMRE），担任高级科学家及项目负责人，主持有机发光二极管与有机光伏领域的研发工作。
朱教授的研究方向包括器件物理、纳米结构与半导体材料，主要应用于有机近红外（NIR）光电探测器、高性能有机太阳能电池，以及有机与钙钛矿光电子器件。2019年，获香港创新及科技基金大学科技初创企业资助计划支持，朱教授创立了宏视科技有限公司 (Crimson Vision Technology Limited）, 致力于近红外光检测技术的开发，专注于便携式NIR检测系统、NIR可视化技术在智慧农业、健康监测、NIR图像传感和光通信领域的应用。
联系人：唐建新 教授